SB(4)		      OpenBSD Programmer's Manual (i386)		 SB(4)

NAME
     sb - SoundBlaster family audio device

SYNOPSIS
     sb0 at isa? port 0x220 irq 5 drq 1
     sb1 at isa? port 0x240 irq 7 drq 1 flags 1
     sb* at isapnp?
     audio* at sb?
     midi* at sb? (MPU401 port)

DESCRIPTION
     The sb driver supports the SoundBlaster 16, Jazz 16, SoundBlaster AWE 32,
     SoundBlaster AWE 64, and hardware register-level compatible audio cards.

     The SoundBlaster series are half-duplex cards, capable of 8- and 16-bit
     audio sample recording and playback at rates up to 44.1kHz (depending on
     the particular model).

     The base I/O port address is usually jumper-selected to either 0x220 or
     0x240 (newer cards may provide software configuration, but this driver
     does not directly support them--you must configure the card for its I/O
     addresses with other software).  The SoundBlaster takes 16 I/O ports.
     For the SoundBlaster and SoundBlaster Pro, the IRQ and DRQ channels are
     jumper-selected.  For the SoundBlaster 16, the IRQ and DRQ channels are
     set by this driver to the values specified in the config file.  The IRQ
     must be selected from the set {5,7,9,10}.

     The configuration file must set the value of flags to 1 to enable the
     Jazz16 support.  This is to avoid potential conflicts with other devices
     when probing the Jazz 16 because it requires use of extra I/O ports not
     in the base port range.

     The joystick interface (if enabled by a jumper) is handled by the joy(4)
     driver, and the optional SCSI CD-ROM interface is handled by the aic(4)
     driver.

SEE ALSO
     aic(4), audio(4), intro(4), isa(4), isapnp(4), joy(4), midi(4), wss(4)

HISTORY
     The sb device driver appeared in NetBSD 1.0.

BUGS
     With a SoundBlaster 16 card the device is full duplex, but it can only
     sensibly handle a precision of 8 bits.  It does so by extending the
     output 8 bit samples to 16 bits and using the 8 bit DMA channel for input
     and the 16 bit channel for output.

     The non-SCSI CD-ROM interfaces found on some older cards are not
     supported.

OpenBSD 4.9			 July 31, 2010			   OpenBSD 4.9

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